How does a relay differ from a contactor in duty and current rating?

• A. A relay is for high currents; a contactor is for control signals
• B. A relay is for low-current control signals; a contactor is designed for higher currents and motor loads
• C. Relays are used only in AC circuits; contactors only in DC circuits
• D. Relays and contactors have identical duty and current ratings

Answer: (B)